Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833

603-778-2300 www.wallindustries.com Fax 603-778-9797

MDW Ultra Wide Series

Single and Dual Output

20 Watt DC/DC Converter

4:1 Wide Input Voltage Range

MECHANICAL DRAWING

PIN CONNECTION

PIN

SINGLE

DUAL

1

+INPUT

+INPUT

2

-INPUT

-INPUT

3

+OUTPUT

+OUTPUT

4

TRIM

COMMON

5

-OUTPUT

-OUTPUT

6

CTRL

CTRL

Recommended EN55022 Class B Filter Circuit Layout

1. All dimensions in Inches (mm)

Tolerance: X.XX±0.02 (X.X±0.5)

X.XXX±0.01 (X.XX±0.25)

2. Pin pitch tolerance ±0.01(0.25)

0.400

(10.16)

0.400

(10.16)

0.50

(12.7)

1.00 (25.4)

0.100 (2.54)

0.200 (5.08)

0.22 (5.6)

0.40

(10.2)

1 2

3

4

5

6

Output can be externally trimmed

by using the method shown below.

EXTERNAL OUTPUT TRIMMING

5

4

TRIM UP

4

3

TRIM DOWN

PIN CONNECTION

PIN

SINGLE

DUAL

1

+ INPUT

+ INPUT

2

- INPUT

- INPUT

3

+ OUTPUT

+ OUTPUT

4

TRIM

COMMON

5

- OUTPUT

- OUTPUT

6

CTRL

CTRL

Recommended Filter for EN55022 Class B Compliance

+Vin

-Vin

+Vout

-Vout

L1

D/D Converter

C1

C4

C3

Load

C2

＋

INPUT

－

INPUT

1

2

3

4

FIGURE 1

EXTERNAL OUTPUT TRIMMING

Output can be externally trimmed by

using the method shown below.

FIGURE 2

The components used in the Figure 1, together with the manufacturers’ part numbers

for these components, are as follows:

C1

C2

C3

C4

L1

MDW24xxx-

xxxx

4.7uF/50V

N/A

1000pF/2KV 1000pF/2KV

450uH

Common Choke

MDW48xxx-

xxxx

2.2uF/100V 2.2uF/100V 1000pF/2KV 1000pF/2KV

325uH

Common Choke

-INPUT

+INPUT

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